cacos.c\complex\src - musl - musl - an implementation of the standard library for Linux-based systems

#include "complex_impl.h"
// FIXME: Hull et al. "Implementing the complex arcsine and arccosine functions using exception handling" 1997
/* acos(z) = pi/2 - asin(z) */
double complex cacos(double complex z)
{
	z = casin(z);
	return CMPLX(M_PI_2 - creal(z), -cimag(z));
}